The Nobel Peace Prize for 2024 was awarded to Nihon Hidankyo, a Japanese organization of Hibakusha, who are atomic bomb survivors. They have continued to fight against people’s ignorance about and indifference to what happened under the atomic bomb mushroom clouds. Peace education is an essential tool for the atomic bomb survivors. Peace education in Hiroshima and Nagasaki is sometimes criticized, however, because it is always emphasizing the damages caused by the atomic bombing. This paper explains the complicated background of the fact that peace education in Hiroshima focuses on the damages. Since the world ignored their suffering due to political censorship and indifference, one of the most significant missions for the survivors was to make people understand the horrible reality under the clouds. The paper then discusses how the philosophy of education can contribute to disentangling the Hiroshima complexity and shaping mutual understanding.